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Kaposi's sarcoma-associated herpesvirus (KSHV) is a human gammaherpesvirus related to Epstein-Barr virus (EBV) and herpesvirus saimiri. KSHV open reading frame K8 encodes a basic region-leucine zipper protein of 237 aa that homodimerizes. K8 shows significant similarity to the EBV immediate-early protein Zta, a key regulator of EBV reactivation and replication. In this study, a carboxyl-terminal deletion mutant of K8, K8(1-115), that had strong transactivating properties was found. Screening using transcriptionally inactive K8(1-75) showed that K8 interacts and co-localizes with hSNF5, a cellular chromatin-remodelling factor, both in vivo and in vitro. This interaction requires aa 48-183 of hSNF5 and 1-75 of K8. In a yeast expression system, the ability of K8 and K8(1-115) to activate transcription requires the presence of SNF5, the yeast homologue of hSNF5. These data suggest a mechanism by which the SWI-SNF complex is recruited to specific genes. They also suggest that K8 functions as a transcriptional activator under specific conditions and that its transactivation activity requires its interaction with the cellular chromatin remodelling factor hSNF5.

Kaposi's sarcoma-associated herpesvirus K8 protein interacts with hSNF5